Add ability to bind typed arrays to script API

Note: Only replaced 2 instances to test, Node.get_children and TileMap.get_used_cells
Note: Will do a mass replace on later PRs of whathever I can find, but probably need
a tool to grep through doc.
Warning: Mono will break, needs to be fixed (and so do TypeScript and NativeScript, need to ask respective maintainers)

core/object.h

@@ -91,6 +91,7 @@ enum PropertyHint {
 	PROPERTY_HINT_NODE_PATH_VALID_TYPES,
 	PROPERTY_HINT_SAVE_FILE, ///< a file path must be passed, hint_text (optionally) is a filter "*.png,*.wav,*.doc,". This opens a save dialog
 	PROPERTY_HINT_INT_IS_OBJECTID,
+	PROPERTY_HINT_ARRAY_TYPE,
 	PROPERTY_HINT_MAX,
 	// When updating PropertyHint, also sync the hardcoded list in VisualScriptEditorVariableEdit
 };